Detonation velocity photoelectric test method and apparatus of detonating cord

Abstract

The invention relates to a photoelectric testing method for the detonating speed of a detonating fuse and a device thereof. The device is characterized in that the device at least comprises two multimode fibre probes inserted into the detonating fuse in certain distance, a fibre coupling connector, a PIN integrated photoelectric detector, a power supply, an FPGA high-speed data acquisition module and a liquid crystal display screen; the PIN integrated photoelectric detector is used to carry out time sharing processing on the temporal fore-and-aft relation of optical signals acquired by the probes in time; optical signals of a plurality of probes are converted into pulse electric signals and are transported to the FPGA high-speed data acquisition module; the input pulse electric signals are subjected to sampling, calculation processing, control and caching; the distance of each two probes of the plurality of the probes and the measured time are subjected to calculation processing to seek an average speed; the detonating speed and relevant data of the detonating fuse are transmitted to the liquid crystal display screen and are displayed; and the photoelectric testing method has the advantages of high testing precision, strong antijamming capacity, small volume, simple operation and the like.

Description

technical field [0001] The invention belongs to the field of machinery and electronics, and mainly relates to a detonating cord detonation velocity testing technology, in particular to a detonating cord detonation velocity photoelectric testing method and device based on a multimode optical fiber probe. Background technique [0002] The detonating cord is made of explosives as the drug core and coated with a moisture-proof agent on the surface. It is also called the detonating wire. It is an industrial explosive product that transmits detonation waves at a certain detonation speed. Detonation work. When the explosive core at the end of the detonating cord is stimulated by a certain intensity of explosion impact energy, it is detonated, and the detonation propagates along the charge core at a certain speed. When it reaches the end, the detonation is completed and a shock wave of a certain intensity is output. Used to detonate other explosives. The speed at which the detonat...

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Problems solved by technology

[0005] Chinese Patent Publication No.: CN2123753U discloses a timing method explosive detonation velocity detector, which proposes the optical measurement method with optical fiber, but the signal processing circuit has four parallel circuits, and the components adopt separate devices, which have low reliability and large volume

Judging from the published literature, there are reports on the probe method for detonation velocity measurement at home and abroad, and optical fiber is also used for detonation velocity measurement research, but their structures are relatively complicated and are only suitable for application in laboratories.

For example, the article "Application of Optical Fiber in Burning Velocity and Detonation Velocity Test" published in "Pyrotechnics" in 2000 researched the burning velocity of optical fiber used in pyrotechnics and the detonation velocity of pyrotechnics. Due to the signal amplitude and photoelectric Influenced by the sensitivity of the detector, the method needs to amplify the electrical signal, and the system adopts multiple parallel connections, which is more complicated, and the display device uses a storage oscilloscope, which is completely laboratory equipment, which is inconvenient for reliable use in the field, let alone industrialization

Published in "Journal of Aircraft Measurement and Control" in 2001, "Fiber Optic Sensors and Its Application in Conventional Weapon Tests" reported that a number of 0.2mm holes were drilled on plexiglass optical fibers with a diameter of 1mm abroad for detonation velocity testing. The needle processing technology is relatively complicated, and the whole probe needs to go deep into the explosive column. It is difficult for the field test of the long detonating cord

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